Cast
George Merritt
German: German Shelter Marshal
Michael Redgrave
Russian
Will Hay
Skipper
Bernard Miles
Royal Navy Mate
Michael Rennie
George
Frank Cellier
Schneider
Cyril Chamberlain
Press
Thora Hird
German barmaid (uncredited)
Ronald Shiner
Shipping clerk (uncredited)
Michael Wilding
Captain (uncredited)
John Mills
Tom
Marius Goring
German Propaganda Officer
Albert Lieven
Gunter
John Stuart
Royal Navy: Naval Officer
George Woodbridge
Quisling
Ronald Adam
German businessman (uncredited)
Leslie Banks
Taylor
John Williams
Voice over (uncredited)
Robert Morley
Von Geiselbrecht
Austin Trevor
U-boat Captain
Manning Whiley
Naval officer (uncredited)
Alfred Drayton
Direktor
Morland Graham
Civil Service
John Boxer
Press
Frederick Piper
Malta official (uncredited)